/* 子绝父相 */
.box{
    width: 1226px;
    height: 600px;
    margin: 50px auto;
    position: relative;
}
.box .words{
    height: 150px;
    width: 100%;
    background:rgba(0,0,0,.6);
    position: absolute;
    left: 0;
    bottom: 0;
}